Invalidity dossier
US 6148261
Personal communication system to send and receive voice data positioning information
Current assignee: American Calcar, Inc.
Added 8/27/2026, 12:47:12 AM
Active provider: DeepSeek · deepseek-v4-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 6148261 A
Title: Personal communication system to send and receive voice data positioning information
Patent number: US 6,148,261 A
Application number: US 08/879,955
Inventors: Michael L. Obradovich; John Dinkel; Michael Kent
Original assignee: American Calcar Inc. (assignment records in the excerpt also name Calcar Advertising Inc. and Calcar, Inc.)
Current assignee listed: Silver State Intellectual Technologies Inc.
Priority/filing date: 1997-06-20
Publication (grant) date: 2000-11-14
Legal status: Expired – Lifetime; anticipated expiration 2017-06-20
Purpose and plain-language scope (from the supplied text only):
The excerpt identifies the invention as a personal communication system that sends and receives voice, data, and positioning information. Recurring prior-art keywords in the source are "map," "processor," "map information," "communicator," and "information," indicating a system in which a processor handles map information and a communicator exchanges information. The classifications assigned to the document place it in wireless communication services using location information (H04W 4/02, H04W 4/024), navigation and route guidance with on-board input/output arrangements and map display (G01C 21/20, 21/26, 21/34, 21/36, 21/3667), electronic map transmission to and from central databases (G01C 21/3885, 21/3889, 21/3896), in-vehicle traffic and navigation instruction systems (G08G 1/0962, 1/0968, 1/0969), and electronic map position indicators (G09B 29/10, 29/106). The family includes later-filed continuations and related publications, e.g. US 6,529,824 B1, US 6,515,595 B1, US 6,924,748 B2, US 6,868,335 B2, US 7,236,100 B2, US 7,702,455 B2, US 7,561,065 B2, and US 8,700,312 B2, plus international counterparts (WO 1998059215 A1, EP 0990119 B8, EP 1630523 B1, JP 2002505782 A, CA 2294401 C).
What the excerpt does not establish:
The supplied text contains no claim language, no written description, no drawings, and no prior-art references beyond the keyword list; therefore no specific claim scope, element, or inventive distinction can be verified from it. The excerpt also does not establish inventorship ownership accuracy, the correctness of the listed assignees, or the completeness of the family list.
Generated 10/1/2026, 10:03:51 PM
Cases on file (1)
Group view →Specific litigation cases in our database that name US patent 6148261. The free-form analysis below may also discuss cases beyond this list.
- American Calcar, Inc. v. BMW of North America, LLCfiled Mar 25, 20043:04-cv-00614U.S. District Court, Southern District of Californiaterminated Apr 19, 2006closed
Defendants: BMW of North America, LLC
Other patents asserted: 6009355, 6275231, 6282464, 6330497, 6438465, 6459961, 6529824, 6542795, 6587758, 6587759, 6703944
Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
Current assignee: American Calcar, Inc.
No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
Assignment history
Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.
Prior art
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
Obviousness
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.
Keep exploring
More patents asserted by American Calcar, Inc.
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- US 6529824US6529824B1 — Concise Overview Title: Personal communication system for communicating voice data positioning information Patent number: US6529824B1 Application number: US09/669,527 Filing date: 2000-09-25 Publication/grant date: 2003-03-04…
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This patent in court (1)
1 tracked lawsuit name US 6148261.